Absorbent laminate with multiple substrates

Abstract

The present invention relates to an absorbent laminate structure, and disposable absorbent article incorporating the structure, wherein first and second absorbent matrices comprising particulate superabsorbent polymeric material and filamentary adhesive are arranged between two outer substrate layers. The relatively porous, intermediate or central substrate layer, positioned between the absorbent matrices, promotes liquid transport within the laminate structure.

What is claimed is: 
     
       1. A disposable absorbent laminate, comprising;
 at least three substrate layers, including first, second and third substrate layers each comprising tissue; and 
 first and second absorbent matrices respectively positioned between adjacent ones of said substrate layers, 
 each of said absorbent matrices comprising particulate superabsorbent polymeric material and a network of filamentary adhesive, 
 said filamentary adhesive adhering to and stabilizing said particulate superabsorbent polymeric material, and adhering adjacent ones of said substrate layers to each other to resist delamination of said disposable absorbent laminate, and 
 wherein said third one of said substrate layers, positioned intermediate of said first and second substrate layers, exhibits a Frazier porosity of at least about 300 feet 3 /minute/foot 2 , and differs from a Frazier porosity of at least one of said first and second substrate layers by at least about 70 feet 3 /minute/foot 2 , and wherein said first and second substrate layers each exhibit a Frazier porosity of about 150 feet 3 /minute/foot 2  to 250 feet 3 /minute/foot 2 . 
 
     
     
       2. The disposable absorbent laminate in accordance with  claim 1 , wherein
 said first and second substrate layers exhibit the same porosity. 
 
     
     
       3. The disposable absorbent laminate in accordance with  claim 1 , wherein
 said third substrate layer exhibits a Frazier porosity that differs from a Frazier porosity of at least one of said first and second substrate layers by at least about 130 feet 3 /minute/foot 2 . 
 
     
     
       4. The disposable absorbent laminate in accordance with  claim 1 , wherein
 said disposable absorbent laminate exhibits a modified circular bend value of less than about 30 grams F. 
 
     
     
       5. The disposable absorbent laminate in accordance with  claim 1 , wherein
 said disposable absorbent laminate exhibits a tensile strength of at least about 10 Newtons per 50 mm (N/50 mm). 
 
     
     
       6. A disposable absorbent article, comprising:
 the disposable absorbent laminate in accordance with  claim 1 ; 
 a liquid permeable topsheet positioned above said disposable absorbent laminate; 
 an acquisition/distribution layer positioned between said topsheet and said disposable absorbent laminate; and 
 a liquid impermeable backsheet positioned beneath said disposable absorbent laminate. 
 
     
     
       7. The disposable absorbent laminate in accordance with  claim 1 , wherein said first and second substrate layers each exhibit a basis weight of about 15 to 20 grams/meter 2  (gsm), and wherein said third substrate layer exhibits a basis weight of about 15 to 25 gsm. 
     
     
       8. The disposable absorbent laminate in accordance with  claim 1 , wherein said third substrate layer exhibits a Frazier porosity of at least about 320 feet 3 /minute/foot 2 . 
     
     
       9. An absorbent laminate, comprising:
 first, second and third substrates each comprising tissue; and 
 first and second absorbent matrices respectively positioned between said first and third substrates, and said second and third substrates, 
 each of said absorbent matrices comprising particulate superabsorbent polymeric material and filamentary adhesive, wherein the filamentary adhesive adheres to and stabilizes the particulate superabsorbent material and the two of said substrates adjacent to each absorbent matrix, 
 said third one of said substrates, positioned intermediate of said first and second absorbent matrices, exhibits porosity which is greater than the porosity of said first and second substrates, and 
 said third substrate exhibits a Frazier porosity of at least about 300 feet 3 /minute/foot 2 , said third substrate exhibiting a Frazier porosity which differs from a Frazier porosity of either one of said first and second substrates by at least about 100 feet 3 /minute/foot 2 , and wherein said first and second substrates each exhibit a Frazier porosity of about 150 feet 3 /minute/foot 2  to 250 feet 3 /minute/foot 2 . 
 
     
     
       10. The absorbent laminate in accordance with  claim 9 , wherein
 said second substrate comprises creped tissue. 
 
     
     
       11. The absorbent laminate in accordance with  claim 9 , wherein
 said absorbent laminate exhibits a modified circular bend value of less than about 30 grams F. 
 
     
     
       12. The absorbent laminate in accordance with  claim 11 , wherein
 said absorbent laminate exhibits a tensile strength of at least about 10 Newtons per 50 mm (N/50 mm). 
 
     
     
       13. The absorbent laminate in accordance with  claim 9 , wherein
 said absorbent laminate is symmetrical in a Z-direction.